Hp — taking too much time to provide service yet not provided by them

I have a hp notebook i bought this on 28 of november 2016 in october 2017 its gives trouble to me related to that i call them on 7 of october first they provide me technical assistance on phone thats not work after that they tell me to send picture of retail invoice and problems persist i send all the things that are they demand and wait for their response but they not call then after seven days i call back to them they told me that my warranty is void because seal of dealer was not visible but its visible after that they were just making me fool by demanding more things i complain after waiting one month 1days to consumer forum